Earth’s hottest layer is the core, we use uranium to build nukes, and ocean tides are created by the gravitational pull of the Moon. Like, duh! But did you also know that the boiling point of water decreases with increasing altitude, or that amplitude determines the loudness of a sound wave? Huh?

Michael Stevens explains why darkness moves faster than light in this new episode of Vsauce. I usually find these explainers interesting because they delve not only into multiple science disciplines but often they touch philosophical questions too. This one really blew my mind.

Here's a short video that'll wrinkle your brain a bit. Like debunking 50 common misconceptions, this video shows 13 facts you might not know are true. Like how Neil Armstrong had to clear customs after going to the Moon. Or that Russia is bigger than Pluto. Learning is fun.

Despite carrying user-generated content, Wikipedia has often been criticised for being tough to edit - even by its co-founder Jimmy Wales. But researchers have found another way in which the Web 2.0 wonder might leave people gnashing their teeth: it's much harder to read than that old favourite of doorstep salesmen,…

The Mundurucu tribe are an isolated group living deep within the Amazon rainforest. Their language doesn't have exact terms for numbers or words for most geometric shapes...and yet they outperformed French and American schoolchildren on a geometry test.

It's 2011 and none of us have to go to college, or even high school, or really pass beyond a 5th grade reading level, because Google is a terrific brain-crutch. But how well can you crutch along the knowledge trail?

Like the Science Guy before him, Bill Hammack the Engineer Guy takes stuff you ordinarily might not be interested in—like how exactly a photocopier works—and makes it fun and digestible. Now where's the Taxes Guy. [Engineer Guy]